<template>
  <section class="real-app">
    <input type="text"
      class="add-input"
      autofocus="autofocus"
      placeholder="输入日程"
      @keyup.enter="addTodo"
    >
    <Item
     :todo="todo"
     v-for="todo in filteredTodos"
     :key="todo.id"
     @del="deleteTodo"
     />
    <Tabs 
    :filter="filter" 
    :todos="todos"
    @toggle="toggleFilter"
    @clearAllCompleted="clearAllCompleted"
    />
  </section>
</template>

<script>
import Item from './item.vue'
import Tabs from './tab.vue'
let id = 0

export default {
  data(){
    return{
      todos:[],
      filter:'all'
    }
  },
  components:{
    Item,
    Tabs
  },
  computed:{
    filteredTodos(){
      if(this.filter === 'all'){
        return this.todos
      }
      const completed = this.filter === 'completed'
      return this.todos.filter(todo => completed === todo.completed)
    }
  },
  methods:{
    addTodo(e){
      this.todos.unshift({
        id:id++,
        content:e.target.value.trim(),
        completed:false
      })
      e.target.value = ''
    },
    deleteTodo(id){
      this.todos.splice(this.todos.findIndex(todo => todo.id === id,1))
    },
    toggleFilter(state){
      this.filter = state
    },
    clearAllCompleted(){
      this.todos = this.todos.filter(todo => !todo.completed)
    }
  }
}
</script>

<style lang="stylus" scoped>
.real-app{
  width 600px
  margin 0 auto
  box-shadow 0 0 5px #666 
}
.add-input{
  width 100%
  font-size 24px
  font-family inherit
  font-weight inherit 
  line-height 1.4em
  border 0
  outline none 
  color inherit 
  padding 6px
  border:1px solid #999999
  box-shadow :inset 0 -1px 5px 0 rgba(0,0,0,.5)
  box-sizing border-box
  font-smoothing:antialiased
  padding 16px
  border none 
  box-shadow:inset 0 -2px 1px rgba(0,0,0,.5) 
}
</style>
